Fix nested namedtuple crash in incremental mode #12803
Merged
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Make sure the fullname of a named tuple defined within a method matches
the nesting of the definition in the symbol table. Otherwise we'll have a
crash during deserialization.
In particular, a named tuple defined within a method will now be always
stored in the symbol table of the surrounding class, instead of the global
symbol table. Previously there was an inconsistency between old-style
and new-style syntax.
Fix #10913.